85 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2009 Wolfram Sang, Pengutronix4 *5 * Check max730x.c for further details.6 */7 8#include <linux/module.h>9#include <linux/init.h>10#include <linux/platform_device.h>11#include <linux/mutex.h>12#include <linux/i2c.h>13#include <linux/spi/max7301.h>14#include <linux/slab.h>15 16static int max7300_i2c_write(struct device *dev, unsigned int reg,17 unsigned int val)18{19 struct i2c_client *client = to_i2c_client(dev);20 21 return i2c_smbus_write_byte_data(client, reg, val);22}23 24static int max7300_i2c_read(struct device *dev, unsigned int reg)25{26 struct i2c_client *client = to_i2c_client(dev);27 28 return i2c_smbus_read_byte_data(client, reg);29}30 31static int max7300_probe(struct i2c_client *client)32{33 struct max7301 *ts;34 35 if (!i2c_check_functionality(client->adapter,36 I2C_FUNC_SMBUS_BYTE_DATA))37 return -EIO;38 39 ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);40 if (!ts)41 return -ENOMEM;42 43 ts->read = max7300_i2c_read;44 ts->write = max7300_i2c_write;45 ts->dev = &client->dev;46 47 return __max730x_probe(ts);48}49 50static void max7300_remove(struct i2c_client *client)51{52 __max730x_remove(&client->dev);53}54 55static const struct i2c_device_id max7300_id[] = {56 { "max7300" },57 { }58};59MODULE_DEVICE_TABLE(i2c, max7300_id);60 61static struct i2c_driver max7300_driver = {62 .driver = {63 .name = "max7300",64 },65 .probe = max7300_probe,66 .remove = max7300_remove,67 .id_table = max7300_id,68};69 70static int __init max7300_init(void)71{72 return i2c_add_driver(&max7300_driver);73}74subsys_initcall(max7300_init);75 76static void __exit max7300_exit(void)77{78 i2c_del_driver(&max7300_driver);79}80module_exit(max7300_exit);81 82MODULE_AUTHOR("Wolfram Sang");83MODULE_LICENSE("GPL v2");84MODULE_DESCRIPTION("MAX7300 GPIO-Expander");85